Gas exhaust silencer

ABSTRACT

A silencer having two similar opposed baffles, each frustoconical in shape, and each having its enlarged open end contiguous with the similar end of the other, and with the apex of the first baffle being adjacent the inlet end of the sound absorbing chamber in which the baffles are disposed.

United States Patent 1 1 Blatt et a1.

1541 GAS EXHAUST SILENCER [76] Inventors: Leland Feancis Blatt; Frank H.Wiesenhol'er, both of PO. 24121 Mound Road, Warren, Mich. 48091 [52]U.S.Cl. ..181/60, 181/69, 181/71, 181/36 A [51] Int. Cl. ..Fln l/l0,FOln 7/16 [58] Field of Search ..181/36 R, 36 A, 46, 56, 60, 181/68-72,42, O

1451 Jan. 23, 1973 938,101 /1909 Winters ..181/70 2,218,063 10/1940Munzer ....18l/69 X 2,575,233 11/1951 Plasse ..181/70 3,381,774 5/1968Stade et al. ..181/69 X FOREIGN PATENTS OR APPLICATIONS PrimaryExaminer-Robert S. Ward, Jr. An0rneyRobert A. Sloman s71 ABSTRACT Asilencer having two similar opposed baffles, each [56] References Citedfru'sto-conical in shape, and each having its enlarged open endcontiguous with the similar end of the other, UNITED STATES PATENTS andwith the apex of the first baffle being adjacent the 2,019,746 ll/l935inlet end of the sound absorbing chamber in which the 2,122,086 6/1938baffles are disposed. 2,576,610 11/1951 2,950,775 8/1960 Zwayer ..181/36A 1 Claim, 2 Drawing Figures GAS EXHAUST SILENCER GENERAL DESCRIPTIONThis application is a division of our prior application Ser. No. 81,051,filed Oct. 15, 1970, now U.S. Pat. No. 3,672,465, issued June 27, 1972,and is directed to the species of FIG. 5 of that application as it wasfiled. The silencer hereof is a novel form of effective small sizesilencer particularly adapted for machine tools and the like and theprincipal object of the present invention is to provide a novel form ofsilencer, inexpensive and easy to assemble as well as to mount in placeon an exhaust line.

A preferred embodiment of such silencer is shown in the appendeddrawing.

In such drawing:

FIG. 1 is a side elevation view;

FIG. 2 is a longitudinal section thereof.

DETAILED DESCRIPTION The silencer herein disclosed comprises acylindrical sound absorbing housing 46 closed at its inlet end by aclosure plate 48 with a threaded opening 50 for attachment to an exhaustpipe of a machine tool or the like. Within the chamber 52 of the housingis a first baffle 56 of frustoconical shape and preferably of sinteredbronze or the like with its rounded apex 57 adjacent the inlet 50 andwith its enlarged open end, flanged at 58, adjacent a similar end,flanged at 66, of a second and similar baffle 64 with its apex 62 andadjacent side areas providing the outlet for the silencer.

A locking ring 68 holds flanges 58 and 66 in place against a lockingshoulder 60 of the housing 46 and a sealing ring 70 seals the baffles toeach other.

At 80 is shown a third bafile in the plane of the contiguous open endsof the first two baffles. Baffle 80 is of any suitable permeablematerial to enable gas flow through it from the interior of the firstbaffle to the interior of the second baffle from where the gas flowexits to atmosphere.

The housing is shown as having numerous fine slits 82 for assisting insound reduction.

The interior chamber of the housing 46 is shown as empty; however it maybe packed as loosely or as firmly as desired, with a permeable packingof sound absorbing material 54.

The construction herein disclosed has been found to be extremelyeffective in reducing noises due to exhaust gases in devices such asindustrial tools and the like and as disclosed is extremely simple andinexpensive of manufacture and assembly, and mounting on an exhaustpipe.

An important feature of the present invention is the economy ofmanufacture, in part arising from the fact that baffles 56 and 64 areidentically formed of sintered bronze, as by casting. It is regarded asequivalent that the material may be porous metal, plastics or ceramics.

Now having described the silencer herein disclosed, reference should behad to the claims which follow.

We claim:

1. A silencer comprising a double open end thick sound absorbing smalldiameter metal cylinder housing; one end of said housing having an inletconnected to a source of exhausted air; two sintered bronze bafflesdisposed within said housing adjacent said open ends;

with said baffles being op positely arranged truncated cones havingtheir enlarge open ends contiguous; and

with one baffle having its apex adjacent said inlet; and with the otherbaffle having its apex projected through and extending outwardly of theother end of said housing, outletting to atmosphere; and a plate-likepermeable third baffle disposed between and across the open ends of thefirst and second baffles; the housing and first two baffles being ofsuch a thickness to diameter ratio as to be extremely resistant tovibrations, as would be the case if they were of thin sheet material.

1. A silencer comprising a double open end thick sound absorbing smalldiameter metal cylinder housing; one end of said housing having an inletconnected to a source of exhausted air; two sintered bronze bafflesdisposed within said housing adjacent said open ends; with said bafflesbeing oppositely arranged truncated cones having their enlarged openends contiguous; and with one baffle having its apex adjacent saidinlet; and with the other baffle having its apex projected through andextending outwardly of the other end of said housing, outletting toatmosphere; and a plate-like permeable third baffle disposed between andacross the open ends of the first and second baffles; the housing andfirst two baffles being of such a thickness to diameter ratio as to beextremely resistant to vibrations, as would be the case if they were ofthin sheet material.